跪求这10个题答案!凡参加者都有奖!10个都说清楚的至少90分以上…(这诚意明晃晃啊)大叔大婶come on AV8D
跪求这10个题答案!凡参与者都有奖!10个都说清楚的至少90分以上……(这诚意明晃晃啊!)大叔大婶come on AV8D!
(传个破图片真费劲)言归正传这是别人发的一个帖子但是我实在想知道这些问题答案(越清楚越好)所以我自己在补发一次,望各位大仙多多支持,谢谢
众仙家快快施展神通吧
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你把题目抄一遍,可能就有人回应了
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据说参与留言者都有分拿.
因此我留言了
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凡参与者都有奖!
为了这句话,我来留言了
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希望能得奖
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我只会动感光波可以得奖吗
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第七题
dbmopen() ;dbase_open() ;filepro() ;filepro_rowcount() ;filepro_retrieve() ;
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参与有奖 参与有奖~~~~~~~
------解决思路----------------------我是来参与的。。。
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我是来蹭分的!
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就知道第十个
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这是全能型的吗?前端后端都有了。还有运维。。。
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1.
<br /> <?php<br /> class Printer { //代理对象,一台打印机<br /> public function printSth() {<br /> echo 'I can print <br>';<br /> }<br /> <br /> // some more function below<br /> // ...<br /> }<br /> <br /> class TextShop { //这是一个文印处理店,只文印,卖纸,不照相<br /> private $printer;<br /> <br /> public function __construct(Printer $printer) {<br /> $this->printer = $printer;<br /> }<br /> <br /> public function sellPaper() { //卖纸<br /> echo 'give you some paper <br>';<br /> }<br /> <br /> public function __call($method, $args) { //将代理对象有的功能交给代理对象处理<br /> if(method_exists($this->printer, $method)) {<br /> $this->printer->$method($args);<br /> }<br /> }<br /> }<br /> <br /> class PhotoShop { //这是一个照相店,只文印,拍照,不卖纸<br /> private $printer;<br /> <br /> public function __construct(Printer $printer) {<br /> $this->printer = $printer;<br /> }<br /> <br /> public function takePhotos() { //照相<br /> echo 'take photos for you <br>';<br /> }<br /> <br /> public function __call($method, $args) { //将代理对象有的功能交给代理对象处理<br /> if(method_exists($this->printer, $method)) {<br /> $this->printer->$method($args);<br /> }<br /> }<br /> }<br /> <br /> $printer = new Printer();<br /> $textShop = new TextShop($printer);<br /> $photoShop = new PhotoShop($printer);<br /> <br /> $textShop->printSth();<br /> $photoShop->printSth();<br /> ?><br />
2.在可点击的位置上加Google Analytics
3.
减少数据访问(减少磁盘访问)
返回更少数据(减少网络传输或磁盘访问)
减少交互次数(减少网络传输)
减少服务器CPU开销(减少CPU及内存开销)
利用更多资源(增加资源)
4.200w太少,随便导。大数据可以分表分批导
5.
<br />function Person(){<br /> this.name = “Mike”;<br /> this.sayGoodbye = function(){"alert(GoodBye!");};<br />}<br /><br />Person.prototype.sayHello = function(){alert(”Hello!”);};<br /><br />function Student(){}<br /><br />Student.prototype = new Person();<br />
6.低偶合,高内聚。
7.chdir, move_uploaded_file, chgrp, parse_ini_file, chown, rmdir, copy, rename, fopen, require, highlight_file, show_source, include, symlink, link, touch, mkdir, unlink
9.
<br />$file = "temp.txt"; <br />$fp = fopen($file , 'w'); <br />if(flock($fp , LOCK_EX)){ <br /> fwrite($fp , "abc\n"); <br /> flock($fp , LOCK_UN); <br />} <br />fclose($fp); <br />
10.
<br />echo strtotime('2014-9-23 10:30:25');<br />
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3 优化数据库 建索引
4mysqldump 导出
10 strtotime()

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.

To protect the application from session-related XSS attacks, the following measures are required: 1. Set the HttpOnly and Secure flags to protect the session cookies. 2. Export codes for all user inputs. 3. Implement content security policy (CSP) to limit script sources. Through these policies, session-related XSS attacks can be effectively protected and user data can be ensured.

Methods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.

Thesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi

In PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.


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